If X + y is equals to 9 x y is equals to 20 then x cube + y cube is equals to what
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Answer:
189
Step-by-step explanation:
x + y = 9
xy = 20
x³ + y³ = (x + y)³ - 3xy(x+y) ( ∵ (a + b)³ = a³ + b³ + 3ab(a + b) )
= (9)³ - 3 * 20 * 9
= 729 - 540
= 189
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